Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 549, Issue -, Pages 228-232Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.04.047
Keywords
Syntactic foam; Liquid metal infiltration; Mechanical characterisation; Failure; Fracture
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Al alloy syntactic foams containing hollow or porous ceramic microspheres were fabricated by melt infiltration. Tensile, shear, confined compressive and unconfined compressive tests were performed and the failure modes in compression were studied. The tensile and shear strengths were insensitive to the types of the ceramic microspheres. In confined compression, all syntactic foams failed by progressive collapse of the microspheres. Different failure mechanisms were observed in unconfined compression. The syntactic foams with stronger ceramic microspheres failed by Griffith rupture, with cracks oriented at approximately 30 degrees to the loading direction and the compressive strengths being about eight times of their tensile strengths. The syntactic foams with weaker ceramic microspheres failed by progressive collapse of the ceramic microspheres and had lower compressive strengths. (c) 2012 Elsevier B.V. All rights reserved.
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